EP0540380A1 - Système optique de projection d'images multiples, en relation adjacente, sans discontinuités d'éclairement - Google Patents

Système optique de projection d'images multiples, en relation adjacente, sans discontinuités d'éclairement Download PDF

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Publication number
EP0540380A1
EP0540380A1 EP92402696A EP92402696A EP0540380A1 EP 0540380 A1 EP0540380 A1 EP 0540380A1 EP 92402696 A EP92402696 A EP 92402696A EP 92402696 A EP92402696 A EP 92402696A EP 0540380 A1 EP0540380 A1 EP 0540380A1
Authority
EP
European Patent Office
Prior art keywords
lens
image
discrete
optical system
light rays
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92402696A
Other languages
German (de)
English (en)
Inventor
Arthur W. Vogeley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
nView Corp
Original Assignee
nView Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by nView Corp filed Critical nView Corp
Publication of EP0540380A1 publication Critical patent/EP0540380A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1066—Beam splitting or combining systems for enhancing image performance, like resolution, pixel numbers, dual magnifications or dynamic range, by tiling, slicing or overlapping fields of view
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3147—Multi-projection systems

Definitions

  • the present invention relates to a multiple image projection system for projecting two or more discrete images in adjoining relation on a view screen, and particularly relates to an optical system for projecting discrete multiple images in adjoining relation on a view screen to form a single seamless image thereon without substantial illuminance discontinuities at the juncture of the images.
  • the present invention further relates to image projection displays of the liquid crystal display panel type, although the invention has applicability to other types of displays such as CRT projection systems.
  • the invention is also not limited to either monochrome or color displays and embraces both rear projection and front projection installations.
  • the illumination on the screen at any point therealong is a function of the distance the screen lies from the light source and the inclination of the screen surface relative to the light source.
  • the human eye is quite tolerant of illumination changes occurring over the surface of a screen and, thus, projector condenser lens systems having an acceptance cone angle of approximately 90° are quite common.
  • a discontinuity in illuminance for example, when it is desired to project multiple images, however, is considerably less tolerable.
  • An illuminance discontinuity of less than 5% is readily observable and undesirable.
  • the cause of illuminance disparity when two or more images are projected and touch one another is a function, among other things, of the location of the observer.
  • illuminance disparity does not occur if the observer views the screen from a point directly in front of the screen and equidistant from the projection lenses.
  • the observer moves to one side or the other, the touching edges of the images become brighter or darker as a result of the different bend angles of the light rays emanating from the viewing screen from the different projection lenses.
  • the optical paths of the two or more images to be projected are combined to form a larger, single image displayed on a view screen by a novel and improved condenser and projection lens system without substantial illuminance discontinuity or a seam between the two projected images.
  • a novel and improved condenser and projection lens system without substantial illuminance discontinuity or a seam between the two projected images.
  • a pair of discrete images are disposed in adjoining relation on a view screen to form a single image thereon with minimal or no illuminance discontinuity at their juncture.
  • a light source a condensing lens, a mirror system, a pair of discrete image displays, and a projection lens.
  • the image displays may be LCD crystals or any other type of conventional image displays.
  • An optical system including a lens and mirror is employed for transmitting the light rays from the light source separately through each of the image displays. That is, the lens and mirror project light rays from the source along discrete optical paths for passage separately through each image display.
  • a single projection lens defining an optical axis is provided for projecting the images in adjoining relation on a view screen.
  • an optical system including a lens and mirror for combining the light rays passing through the image displays along discrete optical paths for passage through the projection lens such that a single image combining the images from the discrete image displays in substantially seamless adjoining relation is formed on the view screen.
  • the optical system between the image displays and the projection lens projects the light rays passing through each display for passage through the projection lens such that the light rays forming the adjoining edges of the discrete images on the view screen pass along the optical axis of the projection lens, whereby a single, substantially-seamless image is formed on the view screen.
  • a particular advantage of the present invention resides in the ability to physically join optically what cannot practically be physically joined in a mechanical sense. That is, because of construction methods, mounting circuitry, etc., liquid crystal panels, CRTs and the like cannot generally be physically joined to make a single, larger object
  • the present invention effects that image jointure optically.
  • the optical system of the present invention is preferably comprised of an afocal pair of lenses. These lenses produce collimated light between them enabling their separation distances to be changed without affecting the optical characteristics of the system. Fresnel lenses could be used if desired.
  • the afocal lenses in combination with mirrors or other lenses, allow part of the optical path to be diverted to one side, allowing separate transparent image displays, such as LCDs with interfering borders, to be optically combined in such manner that the borders do not appear in the image or interfere with the juncture of the images.
  • additional image displays can be combined to form a single image on a viewing screen without illuminance discontinuities.
  • four image displays can be combined by using one quadrant of the illuminating light in the condenser lenses for each image display. In this case, four mirrors are required in each quadrant to form the optical paths through the lens system, and to divert the light rays from the image displays through the optical axis of the projection lens.
  • four side-by-side images can be displayed as a single combined image on a viewing screen without substantial illuminance discontinuities.
  • an optical system for simultaneously projecting discrete images in adjoining relation on a view screen to form a single image therein with minimal illuminance discontinuities at their juncture, comprising a light source, at least a pair of discrete image displays, a lens system for projecting light rays from the source for passage separately through each image display, a projection lens for projecting an image on the view screen and defining an optical axis and means for projecting the light rays passing through each display for passage through the projection lens such that light rays forming the adjoining edges of the discrete images on the view screen pass along the optical axis of the projection lens, whereby a single image is formed on the view screen.
  • an optical system for simultaneously projecting discrete images in adjoining relation on a view screen to form a single image thereon with minimal illuminance discontinuities at their juncture, comprising a light source, a pair of discrete image displays, a lens system for projecting light rays from the source along discrete optical paths for passage separately through each image display and a projecting lens for projecting an image on the view screen.
  • Means are provided for combining the light rays passing through the image displays along the discrete optical paths for passage through the projection lens such that a single image combining the images from the discrete image displays in substantially seamless adjoining relation is formed on said view screen.
  • an optical system for simultaneously projecting more than a pair of discrete images in adjoining relation on a view screen to form a single image thereon with minimal illuminance discontinuities at their juncture, comprising a light source, more than a pair of discrete image displays, a lens system for projecting light rays from the source along discrete optical paths for passage separately through each image display and a projecting lens for projecting an image on the view screen.
  • Means are provided for combining the light rays passing through the image displays along the discrete optical paths for passage through the projection lens such that a single image combining the images from the discrete image displays in substantially seamless adjoining relation is formed on the view screen.
  • an optical system including a projection system 10 within a housing for projecting images on a view screen 12.
  • a pair of images I1 and I2 are projected on screen 12 in side-by-side relation one to the other.
  • the juncture of the images is illustrated at J. While the images I1 and I2 are illustrated in side-by-side relation with the juncture J extending in a vertical direction, it will be appreciated that the images I1 and I2 may be superposed one over the other with the juncture between the images extending in a horizontal direction. Other orientations of the images I1 and I2 are possible.
  • the projection system 10 forms the images I1 and I2 such that the juncture J has minimal or no illuminance discontinuities. In this manner, the viewing eye will discern essentially a single image comprising the combined images I1 and I2 with high resolution with little or no illuminance disparity between the images along the juncture.
  • each projection system of the illustrated prior art system includes a light source 14, a spherical mirror 16 for concentrating the light rays for direction through a condenser lens 18 and a second condenser lens 20.
  • the light rays are directed through an image display 22 for projection of the image through a projection lens 24 for display on viewing screen 26.
  • Each illustrated prior art projection system is paired with another duplicate projection system such that the adjoining edges of the images projected thereby lie along a juncture on the view screen 26.
  • an observer O1 directly in front of the viewing screen in line with the juncture of the two images observes no illuminance disparity between the projected images.
  • all other observers, for example, observer O2 sees a substantial difference in the brightness and darkness of the edges of the images at their junction, hence, a substantial illuminance disparity. Accordingly, it is this disparity which the present invention substantially eliminates.
  • the optical projection system hereof includes a light source 30, a spherical mirror 32 for concentrating the light rays, and a condenser lens 34 for directing the light rays to the first lens 36 of paired afocal lenses 36 and 42.
  • the light rays through the left-half of the first lens 36 are directed against a first flat mirror 38, then a parallel second flat mirror 40 for directing the collimated light through a second lens 42 of the pair of afocal lenses.
  • the light rays passing, for example, through one-half of the first lens 36 are directed through one-half of the second lens 42.
  • An image display 44 is disposed along the optical path for receiving the light rays passing through the portions or segments of the paired afocal lens 36 and 42.
  • the light rays passing through the segment of lens 42 are focused by that lens for entry into the single projection lens 49.
  • the light rays from the lens 42 passing through image display 44 are directed by flat mirror 46 and 48 for entry through projection lens 46 in such manner that the inner margin of image display 44 lies along the optical axis A of projection lens 46, while the light rays passing through the outer margin of image display 44 are denoted by the letters OM.
  • the opposite or right-hand portion of the optical system illustrated in Figure 3 is the mirror image of the left-hand portion described above.
  • light rays from source 30 pass through the other segment or portion of lens 36 for passage through a portion of a second lens 42′ by means of flat mirrors 38′ and 40′.
  • the light rays passing through the segment of lens 42′ also pass through discrete image display 44′ and are focused for passing through the single projection lens 46.
  • Mirrors 46′ and 48′ return the optical path to projection lens 46.
  • the light rays passing through the inner margin of image display 44′ lie along the optical axis A of the projection lens 46, while those passing through the outer margin of image display 44′ are designated OM′.
  • the inner margins of the image displays 44 and 44′ lie along the juncture J on the view screen 26, but with minimal or no illuminance disparity at their juncture. That is, the images at their juncture blend with one another without discernible disparity in illuminance.
  • FIG 4 there is illustrated an image projection system according to a further embodiment of the present invention wherein four discrete images are projected onto a viewing screen, with substantially no illuminance disparity at the adjoining edges of the images.
  • the projection system illustrated in Figure 4 includes a light source 50, a spherical mirror 52 for concentrating the light rays, and a condensor lens 54 for directing the light rays to the first lens 56.
  • Lens 56 directs light rays against the four flat mirrored surfaces 58, 60, 62 and 64 of an upright pyramidally-shaped structure 66 supporting the mirrored surfaces.
  • each of the mirrored surfaces 58, 60, 62 and 64 onto a mirror and lens system identical one to the other in each of the four quadrants. Only one of the mirror and lens system in a single quadrant will be described, it being appreciated that each of the other three mirror and lens systems in their associated quadrants is identical to the system to be described. Also, it will be appreciated that Figure 4 illustrates two of the mirror and lens systems in opposite quadrants and that an additional pair of mirror and lens systems to be described lie in the other two quadrants opposite surfaces 60 and 64, respectively.
  • the mirror and lens system in this embodiment include a first flat mirror 68 disposed parallel to the reflecting mirror 58 formed on the pyramid structure 66.
  • the collimated light reflected from mirror 58 onto mirror 68 is passed through a quadrant of a second lens 69 forming part of the paired afocal lens 56 and 69.
  • the lens 69 may comprise a single-layer lens with the light from the four mirrored surfaces passing through associated quadrants of the single lens.
  • An image display 72 is disposed along the optical path for receiving the light rays passing through the portions or segments of the paired afocal lenses 56 and 69. The light rays passing through image display 72 are focussed for entry into a single projection lens 73.
  • the light rays from lens 69 pass through the image display 72 and are directed by the flat mirror 70 for reflection onto one of the mirrored surfaces 74 of a plurality of mirrored surfaces 74, 78, 80 and 82 formed on the surface of an inverted pyramidal structure 76.
  • the pyramidal structure 76 has mirrors arranged similarly as pyramidal structure 66, but downwardly directed.
  • the light rays passing through image display 72 are reflected by mirrors 70 and 74 and pass through the focussing lens 73 for display on a viewing screen 84.
  • each of the four illustrated mirrored surfaces 68, 70, 68′ and 70′ represent the portions of the light useful for projecting the images onto the viewing screen 84.
  • the image display 72 is rotated in a plane parallel to the base of the pyramidal structure 66 45° to maximize the area of the surfaces useful for transmitting the light.
  • the corners of the rectilinear image display 72 are designated a, b, c and d and the light rays passing through those corners are traced on the drawing with corresponding designations.
  • the rectilinear areas defined by the dotted lines on the pyramidal structure 66 and mirror 68 represent the area of useful light transmitted through the image display 72.
  • the actual image defined at a, b, c and d is projected onto mirrors 70 and 74 for projection through lens 73.
  • the corresponding corners of the image of image display 72 are also illustrated on the viewing screen by the letters a, b, c and d.
  • the corresponding corners of the image of image display 70′ are also illustrated on the viewing screen by the designations a′, b′, c′ and d′.
  • each of the four mirror and lens systems projects the image associated with each system onto the mirrored surfaces associated with the lower pyramid structure 76 for projection by projection lens 73 onto the viewing surface 84.
  • the various images from the four quadrants project the images in a series of rectilinear images in side-by-side relation one to the other to form a single image with minimal illuminance discontinuities at their junctures.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Projection Apparatus (AREA)
  • Stereoscopic And Panoramic Photography (AREA)
EP92402696A 1991-10-31 1992-10-02 Système optique de projection d'images multiples, en relation adjacente, sans discontinuités d'éclairement Withdrawn EP0540380A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/785,921 US5153621A (en) 1991-10-31 1991-10-31 Optical system for projecting multiple images in adjoining relation without illuminance discontinuities
US785921 1991-10-31

Publications (1)

Publication Number Publication Date
EP0540380A1 true EP0540380A1 (fr) 1993-05-05

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US (1) US5153621A (fr)
EP (1) EP0540380A1 (fr)
JP (1) JPH05215988A (fr)

Cited By (4)

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EP0883792A1 (fr) * 1996-03-01 1998-12-16 Durand-Wayland, Inc. Appareil et procede d'inspection optique d'articles
FR2765761A1 (fr) * 1997-07-07 1999-01-08 Rs Automation Romeuf Sauze Aut Dispositif et procede de projection d'images numeriques haute resolution couleurs sur ecran hemispherique
ES2138562A1 (es) * 1997-03-21 2000-01-01 Manzanares Jesus Mari Gonzalez Mejoras y perfeccionamiento que se introducen a la patente de invencion n- 9700628 de fecha 21 de marzo 1997, "cine de proyeccion electronica via satelite".
FR2836727A1 (fr) * 2002-03-04 2003-09-05 Vincent Lauer Dispositif de balayage optique confocal

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EP1774796B1 (fr) * 2004-07-08 2015-09-02 Imax Corporation Equipement et methodes pour afficher des images de haute resolution au moyen des plusieurs affichages de projection
US7604354B1 (en) * 2006-05-10 2009-10-20 Ligon Thomas R Three-dimensional projection apparatus using coaxial optical alignment
US8689784B2 (en) * 2006-09-14 2014-04-08 James Matthew Monsebroten Solar concentrator system
US7961398B2 (en) * 2008-03-05 2011-06-14 Contrast Optical Design & Engineering, Inc. Multiple image camera and lens system
JP5631299B2 (ja) 2008-03-28 2014-11-26 コントラスト オプティカル デザイン アンド エンジニアリング，インク． 全ビーム画像スプリッタシステム
US8441732B2 (en) * 2008-03-28 2013-05-14 Michael D. Tocci Whole beam image splitting system
JP5444963B2 (ja) * 2008-11-26 2014-03-19 セイコーエプソン株式会社 プロジェクタ
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0883792A1 (fr) * 1996-03-01 1998-12-16 Durand-Wayland, Inc. Appareil et procede d'inspection optique d'articles
EP0883792A4 (fr) * 1996-03-01 1999-11-03 Durand Wayland Inc Appareil et procede d'inspection optique d'articles
ES2138562A1 (es) * 1997-03-21 2000-01-01 Manzanares Jesus Mari Gonzalez Mejoras y perfeccionamiento que se introducen a la patente de invencion n- 9700628 de fecha 21 de marzo 1997, "cine de proyeccion electronica via satelite".
FR2765761A1 (fr) * 1997-07-07 1999-01-08 Rs Automation Romeuf Sauze Aut Dispositif et procede de projection d'images numeriques haute resolution couleurs sur ecran hemispherique
FR2836727A1 (fr) * 2002-03-04 2003-09-05 Vincent Lauer Dispositif de balayage optique confocal

Also Published As

Publication number Publication date
JPH05215988A (ja) 1993-08-27
US5153621A (en) 1992-10-06

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